"bobsled" in the noun sense
1. bobsled, bobsleigh
formerly two short sleds coupled together
2. bobsled, bobsleigh, bob
a long racing sled (for 2 or more people) with a steering mechanism
"bobsled" in the verb sense
1. bobsled, bob
ride a bobsled
"The boys bobbed down the hill screaming with pleasure"
Source: WordNet® (An amazing lexical database of English)
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